Should I be worried about my new GM crate engine?

[PGG]

I put a new GM SP383 crate engine in my 72 K5 Blazer last year I have about 700 miles on it so I am still breaking it in. I am worried because it still is spitting what I think is oil from the duel tail pipes. I am assuming the rings are not seated yet but shouldn't they be by now? It is running a little rich so maybe its unburned fuel but is it something I should be worrying about? Any suggestions? Thanks PG

[Wrenchbender Ret]

It is probably water from condensation & unburned fuel. I wouldn't worry about it but I surely would correct the running rich condition. If it was oil you would get a lot of smoke. The excess fuel can wash oil off the cyl. walls & cause excess wear & oil dilution. Besides it probably uses plenty of fuel running normal mixture, let alone running rich.
George

[PGG]

Originally Posted by Wrenchbender Ret

It is probably water from condensation & unburned fuel. I wouldn't worry about it but I surely would correct the running rich condition. If it was oil you would get a lot of smoke. The excess fuel can wash oil off the cyl. walls & cause excess wear & oil dilution. Besides it probably uses plenty of fuel running normal mixture, let alone running rich.
George

Thank you very much. PG

[truckster]

If it's black it's definitely soot. It mixes with the condensation and spits out the tailpipe.

[geezer#99]

It’s likely running rich because you’re idling on the power circuit.
What carb?
What’s your timing set at?

[PGG]

Originally Posted by geezer#99

It’s likely running rich because you’re idling on the power circuit.
What carb?
What’s your timing set at?

Its a Holly Demon carb I dont know on the timing I can find out tomorrow.

Thank you PG

[mattfranklin]

Try to catch what's dripping out in a clean soup can. You can look at it and see that it's probably mostly condensed water.

[truckster]

Take a paper towel and wipe the inside of your exhaust pipe. I'm willing to bet it comes out black and smells like partially-burned gasoline.

[Stormin08]

i highly recommend an A/F gauge...super easy install and tells alot about the tuning of the carb

[SB'72]

PGG,

I know it's early on use, but do you like the power of the GM 383 crate so far.
Also if you used headers which ones did you go with.

Thanks

[PGG]

Originally Posted by SB'72

PGG,

I know it's early on use, but do you like the power of the GM 383 crate so far.
Also if you used headers which ones did you go with.

Thanks

I will try to look up what the headers we bought were it was last year and I cant remember.
So far the motor has more HP then I really needed and great low end torque.
I am still babying it too.

[YoungPup1977]

When you installed the engine last year what did you set the timing to ? where is the idle rpm set to.

[GASoline71]

Break it in like you're gonna drive it. If you're just gonna putt around through parking lots, then baby it. If not, get on it a bit more often. If newer plasma-moly rings were used on the pistons, they're dang near seated when they're driven in by the installer. I wouldn't drive around too long on "break in" oil either.

If you're still driving around with the break in oil in it... change the oil and filter and drive it a bit harder. Unless there is some kind of break in procedure you have to follow for warranty from the builder. Does it have a roller cam and lifters in it? SBC's are stout engines that are built to handle a bit of RPM from the factory, as that is where they make their power.

Gary

[YoungPup1977]

Still worried about the timing. Any progress ?
Hey guys still Worried about that soot in the tail pipe. Years ago the tail pipes use to turn white.
Now a days with the gas the way it is the soot will keep you worrying until you do something to change it.

Don’t worry be happy man !!!
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